Funding for this research was provided by:
National Institute of Diabetes and Digestive and Kidney Diseases
Article History
Received: 2 July 2017
Accepted: 11 July 2017
First Online: 24 July 2017
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The protocols were approved by the Institutional Review Board of the National Institute of Diabetes and Digestive and Kidney Diseases.
: All volunteers were fully informed of the nature and purpose of the studies (#NCT00523627, #NCT00687115 and #NCT00342732), and written informed consent was obtained.